Here's one thing you can Bank on with factory iron heads!
The open chamber heads with there 14 degree valve inclination angle make for a shallower chamber then previously used,, this makes for for a lesser surface to volume ratio which is less detonation prone then the earlier 326/389/421 heads with there stepper valve angles.
The sharp edge change over ridge in the chamber also acts as a much needed fuel re atomizing ledge, and this too makes for lesser detonation issues for any given level of cylinder pressure and heat that's in play.
You guys who have in the process of cleaning up there open chamber Heads with a grinder loaded with a even just a polishing roll and have worked over that sharp lip a lot, or even as I have seen totally ground it the heck out of there thinking higher levels of Intake flow would be had have done yourself a great disservice!!
You have increased the likelihood of detonation.
Even the sharp edge on the Intake valve side of the plug hole should be left there, but just broken to the tune of .005".
This once again is to re-atomize wet flow .
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I do stuff for reasons.
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